Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2817b97c51edfb…

MALICIOUS

PDF

14.5 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 964d4229515c153e4a2bc08352dbf344 SHA-1: c078806fc0d31485133bc330f82bb4e6567c7f27 SHA-256: 5d2817b97c51edfb68925259fadd057fb53e370d7600bd288950f4e5eaa5f313
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, and ClamAV identified it as Win.Trojan.Agent-36166. The embedded JavaScript, although heavily obfuscated, is designed to download and execute a second-stage payload. This indicates a likely exploit attempt, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36166 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36166
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
d81f975dece0314f21c9d783219de217734f4d7a8e64499379ff578373997f3a		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74995 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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